P.S.: if you want to leave a message for someone who uses the same cellular provider that you use, most systems allow you to record a message and then send it to the Contact of your choice; just call your mobile phone’s voicemail service to do so.

I just tried it, and it worked just fine for me. From my VOIP phone, I tried my cell number, and it worked. I then used it with a friend’s cell number, and it worked. The ads are annoying, but it works for me.